package smallchange.oop;

import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Scanner;

public class SmallChangeSysOOP {
    boolean loop = true;
    Scanner scanner = new Scanner(System.in);
    String key = "";
    String details = "-------------零钱通明细-------------";
    double money = 0;
    double balance = 0;
    Date date = null;
    SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm");
    String note = "";

    public void Menu() {
        do {
            System.out.println("\n=============零钱通菜单OOP==============");
            System.out.println("\t\t\t1 零钱通明细");
            System.out.println("\t\t\t2 收益入账");
            System.out.println("\t\t\t3 消费");
            System.out.println("\t\t\t4 退出");
            System.out.print("请选择 1-4：");
            key = scanner.next();

            switch (key) {
                case "1":
                    this.detail();
                    break;
                case "2":
                    this.income();
                    break;
                case "3":
                    this.pay();
                    break;
                case "4":
                    this.exit();
                    break;
                default:
                    System.out.println("输入有误，请重新输入");
            }
        } while (loop);
    }

    public void detail() {
        System.out.println(details);
    }

    public void income() {
        System.out.print("收益入账金额：");
        money = scanner.nextDouble();
        if(money <= 0) {
            System.out.println("收益入账金额必须大于0");
            return;
        }
        balance += money;
        date = new Date();//获取当前日期
        //拼接收益信息到detail
        details += "\n收益入账\t+" + money + "\t" + sdf.format(date) + "\t" + "余额：" + balance;
    }

    public void pay() {
        System.out.print("消费金额：");
        money = scanner.nextDouble();
        if(money <= 0 || money > balance) {
            System.out.println("你的消费金额需在0-" + balance);
            return;
        }
        System.out.print("消费说明：");
        note = scanner.next();
        balance -= money;
        date = new Date();//获取当前日期
        //拼接消费信息到detail
        details += "\n" + note + "\t-" + money + "\t" + sdf.format(date) + "\t" + "余额：" + balance;
    }

    public void exit() {
        String choice = "";
        while(true) { // 要求用户必须输入 y/n ，否则一直循环
            System.out.println("你确定要退出吗？ y/n");
            choice = scanner.next();
            if("y".equals(choice) || "n".equals(choice)) {
                break;
            }
        }
        if(choice.equals("y")) {
            loop = false;
        }
    }
}
